Thermostatic heat control for internal-combustion engines



R. P. WRIGHT THERMOSTATIC HEAT CONTROL FOR INTERNAL COMBUSTION ENGINES Filed Nov, 18, 1920 Patented Jan. 4, 1927.

UNITED STATES I 1,613,006 PATENT OFFICE.

REA r. WRIGHT, or wasnriwerom msrarcr or COLUMBIA, nssreiwon 'ro MARVEL CARBUBETOR COMPANY, 01 FLINT, MICHIGAN, A CORPORATION or INDIANA.

THERMOSTATIC HEAT CONTROL FOR INTERNAL-COMBUSTION ENGINES.

Application fil cd November 18, 1920. Serial No; 424,908.

, This invention relates to certain new and useful improvements in theriiiostetic heat control for internal combustion engines and is a companion application of my applications executed even date herewith, Serial Numbers 424,907 and 424,909, filed November 18, 1920,. the object being to provide a thermostatic heat control in which the thermostat is disposed in the path of travel of the explosive charge in its passage to the engine so that the temperature of the charge itself will control the application-of heat.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claim.

In the drawings,

Figure 1 is a side elevation of an internal combustion engine showing the application of my improved construction of thermostatic heat control thereto, partly in section.

Figure 2 is a section taken on line. 2-2 of Figure 1; and

Figure 3 is a detail view of a thermostat.

'In the drawings, 1 indicates an internal combustion engine, 2 the exhaust manifold and 3 the intake manifold which is herein provided with a central induction pipe 4 having a bracket 5 on which is pivotally mounted a rocker arm 6. The wall of the induction pipe 4 is provided with a stuffing box 7 in which is slidably mounted a rod 8 having an outer end provided with a pin 9 working-in the rocker arm 6 as clearly shown, the inner end of said rocker extending through a slot 10 formed in the free end of a bowed like thermostatic member 11 which is secured to" the inner wall of the induction pipe as shown. Therod 8 is threaded and.

carries nuts 12 to each side of the thermostatic member whereby when the thermostatic member expands the rod will be forced outwardly through the stulfing box and rock the rocker arm 6 as will be hereinafter fully described.

A casting 13 is disposed under the induction pipe having a central carbureting passage 14 which communicates with the outlet of a charge forming device 15. said carbureting passage beingsurrounded by a. heatin chamber 16 having an inlet nipple 17 whic is connected to an outlet'nipple 18 of a coupling 19 b a pipe 20, said coupling being connecte to t e exhaust manifold 2 and having its other and connected to the link 29 being pivotally connected to the end of rocker arm 6. By this construction as the thermostat expands and forces the rod 8 outwardly the rocker arm 6 is moved so as to operate the valve 25 to close the outlet pipe 23 in order to prevent the exhaust gases from circulating through the heating chamber 16.

By connecting the heating chamber to the exhaust line pipe ata point between the en gine and mufiler when the valve 25 is in open position, the exhaust gases seek the pat-h of travel of the least resistance and pass through the heating chamber. As a certain amount of back pressure is created by the m'ufiier and as the gases circulate through the heating chamber the carbureting passage is heated so that the explosive charge in its path of travel to the engine is heated. The thermostat being arranged in the path of travelof the heated charge acts to control the application of heat so that the charge can be maintained at the proper temperature and by adjusting the link in the arm 26 the position of the valve'and the time of closing can be regulated.

When in the position shown, the gases naturally travel through the heating chamher and as the heat of the charge is increased the thermostat expands and gradually closes the valve and when the valve is in closed position, the exhaust gases pass through the ordinary exhaust line pipe and prevent the overheating of the charge.

The construction shown provides a simple means for automatically regulating the temperature of the explosive charge passing to the internal combustion engine but it is of course understood that various changes can be made without departing from the spirit of m invention as I am aware that the heat can applied to the manifold or to the charge forming device but my invention consists broadly in applying heat to the explosive charge in its path oftravel to the internal combustion engine and arranging in the path of travel of said charge a thermostat which controls the passage of heating medium to the heater andI reserve the right to a ply the heater at any desired point.

hat I claim is An internal combustion engine having an exhaust pipe, intake manifold and charge forming device connected thereto, a heater arranged to heat the charge in its passage to the internal combustion engine said heater being in communication with the exhaust pipe through an unclosable passage and provided with a valve controlled outlet, said intake manifold being provided with a stuffing box having a rod slidably mounted therein provided with a threaded end, a rocker arm slid-ably connected to the outer end of said rod and an adjustable connection between said rocker arm and said valve and a bowed thermostatic member mounted within said intake manifold in the path of travel of the charge having a slotted end to receive said rod, said rod being provided with nuts to each side of said thermostatic member.

In testimony whereof I have hereunto afiixed my signature.

' REA P. WRIGHT. 

